With the increase of thickness ratio, the value of x-direction plastic strain and rolling force increase, which aggravates the warping deformation of composite plates; The first pass reduction rate has little effect on the warpage of composite plates; The roll speed ratio has a great influence on the x-direction plastic strain of the composite plate. With the increase of the roll speed ratio, the warpage curvature decreases first and then increases, which is contrary to the change of the rolling force. When the roll speed ratio is 1.15, the composite plate is relatively flat; The reasonable selection of the friction coefficient ratio between the rolled piece and the upper and lower rolls can also restrain the warping of the composite plate.
The forming technology of spherical stainless steel plate for bridge bearings is discussed. The structural characteristics and forming process of spherical stainless steel strip are analyzed, and the balance control law of wrinkle and crack in the process of drawing and bulging combined forming is discussed; Analyzed the key process parameters affecting the forming, such as drawing coefficient, designed a rigid blank holder installation, completed the calculation of blank holder force, press tonnage, punch and die fillet radius and clearance, and designed a spherical stainless steel strip forming die based on separation requirements.
